While the idea is little known in the US, many cultures prefer name days to birthdays. The idea is simple: instead of celebrating your day of birth, you and every other Margaret or Joseph or Andrew are feted on the same day.

The custom has its origins in saints’ feast days, but plenty of non-saintly names exist on national calendars. Wanda is a legendary figure in Poland, so no surprise she has a name day there, along with other Slavic staples like Bogdan, Dobromir, and Grazyna.

Some parents look to these calendars for baby naming inspiration. Born on March 17th? Patrick is a nice name.

Word is that Facebook is now encouraging users to add their name day celebrations to their profiles. Americans love a holiday, from Halloween to Cinco de Mayo. Could name days catch on here?